diff --git a/src/system/kernel/arch/x86/arch_vm.cpp b/src/system/kernel/arch/x86/arch_vm.cpp
index 60c595dbb4..a212fc8fc3 100644
--- a/src/system/kernel/arch/x86/arch_vm.cpp
+++ b/src/system/kernel/arch/x86/arch_vm.cpp
@@ -573,6 +573,11 @@ add_memory_type_range(area_id areaID, uint64 base, uint64 size, uint32 type,
 			continue;
 		}
 
+		if (range->area == -1 && !x86_use_pat()) {
+			// Physical memory range in MTRRs; permit overlapping.
+			continue;
+		}
+
 		if (effectiveType != NULL) {
 			type = *effectiveType = range->type;
 			effectiveType = NULL;